Basically, the Scythe is a very good QUAD cooler but a GREAT dual cooler. I am sure that if we had access to a 4ghz+ dual chip you would have seen the SCN peak earlier than the Ultima. Honestly at these performance levels it really is down to picking nits and you can't go wrong with either one. The SCN is quieter but the Ultima probably has a bit more "top end" to its OC potential. The SCN has more BLING, the Ultima 90 is lighter. etc etc ;)

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